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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration( ) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE V4 11/04/96 938 2402 -14 64 000 3,200 24,000 2,900 16,000 120,000 <1,250 V4 02/03/97 938 1940 -1002 Sheen -- -- __ __ __ -- V4 05/08/97 822 1926 -1104 Sheen V4 08/26/97 822 2080 -1247 015 V4 11111/97 822 2134 -13 12 Sheen V4 03/03/98 822 1567 -744 001 V4 05/20/98 822 1562 -735 007 V4 08/19/98 822 17 19 -887 0 13 V4 11118Y98 822 17 53 -924 009 V4 03/30/99 822 -- -- -_ V4 05/05/99 822 1595 -772 0 01 -- -- -- __ -- V4 08/20/99 822 17 61 -939 000 637 5 14 145 537 190 126 V4 12/06/99 822 1785 -956 0 10 -- -- -- __ __ V4 02/29/00 822 1525 -699 006 V4 05/16/00 822 1526 -7 01 004 V4 09/11/00 822 1759 -933 005 V4 12/13/00 822 1745 -923 Sheen -- -- __ __ __ V4 03/08/01 822 1662 -840 000 680 36,000 7,700 117,000 320,000 <250 V4 06/21/01 822 1797 -974 002 -- -- -- -- -- V4 09/20/01 822 1928 -1105 0 01 V4 12/04/01 8 12 1906 -1094 000 -- -- -- -_ __ -- V4 03/05/02 8 12 1690 -8 78 000 4,480 17,200 2,800 14,100 60,600 h <25 V4 06/11/02 8 12 1851 -1039 000 900 19,600 3,420 15,700 99,400 h 100 V4 06/11/02 812 <50* V4 09/10/02 8 12 1975 -11 63 Sheen 890 11,000 3,510 16,600 106,000 h <50 V4 12/18/02 812 1948 -1136 000 840 22,900 3,280 16,500 96,200 h 520 V4 12/18/02 812 <100* UVB-MWI 02/28/97 742 1867 -- 000 7,200 18,000 2,000 11,000 99,000 1,100 UVB-MW 1 05/08/97 742 1876 -1134 000 5,900 15,000 1,800 9,000 86,000 1,600 UVB-MW 1 05/08/97 742 <200* UVB-MW I d 08/26/97 742 2050 -1308 000 700 18 19 42 2,400 77 g 1pro3ects1739421masierlwplq 120213942gw As Page 42 of 45